I tried the run-walk version of Maffetone training last night. It was a little frustrating, as I ended only running for a minute each time before the heart rate alarm went off. So over the course of 30 minutes, I ran half and walked half. I would have rather just run 30 minutes straight, but I will give this method an honest shot.
If after some time I can run for 30 minutes straight at this low of a heart rate, I will be a semi-believer. I will say that the run-walk method felt way better than that super-slow jogging I did the other day. Running below a certain pace puts too much stress on the body in my opinion.